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Meaning of cotidal

co•tid•al

Pronunciation: (kō-tīd'l), [key]
— adj.
  1. pertaining to a coincidence of tides.
  2. (on a chart or map) indicating a line connecting points at which high tide occurs at the same time.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.